Incandescent-electric-lamp support.



PATENTED APR. 9, 1907.

JpSULLIVAN. INGANDESGBNT ELECTRIC LAMP SUPPORT.

APPLICATION FILED 00124. 1906.

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UNIT ED STLF LTES PATENT QFFICE.

JOHN SULL-lVAN, OF FALL RIVER, MASSACHUSETTS.

lNCzhNDESCENTflELE-ZQTRlG-LAW1P SUPPDRT.

To all whom it may concern:

Be'it known that 1, JOHN SULLIVAN, a citizen of the United States,residing at Fall Riveninithe county of Bristol and State ofMassachusetts, have invented a new and useful Improvement inIncandescent-Electric- Lamp Supports, of which the following is aspecification.

This invention has reference to an imamp, and the'lamp ISSLlPPOSECl tostay in the adjusted position through the friction of the cord andpulleys. As the lamp is raised or lowered for different positions theweight of the cord on the lamp side is decreased or increased, so thatthe lamp (particularly where long cords are used) cannot be accuratelybalanced by the weiglited pulley. In pract'ice I find that the usualjars or vibrations of a building will cause the lamp to move up or downfrom the position required, thus br1nging the lamp into contact with theweighted )ulley, which is liable to and does at times break the lampunder these conditions.

The object of my invention is to improve the construction of anincandescent-(aloetriclamp support whereby the lamp is adjustably susended ,from the support and firmly held in t e adjusted position.

A further'object of my invention tomatically hold the lamp in theposition.

My invention consists in the peculiar and is to anadjusted novelconstruction of an incandescent-electrio-lamp support having detailsofconstruction whereby the lamp is adjustably suspended from the supportand automatically eldin the adjusted position, as will be more fully setforth hereinafter and claimed.

Figure 1 is a side view of my improved incandescent-electric-lampsupport attached to a ceiling and showing the lamb adjustably secured tothe support by a flexi le cord and weighted pulley,w1th the lampautomatically held in the adjusted position. Fig. 2 is an enlarged tacoview of the support looking Specification of Letters 'Patent.

Patented April 9, 1907.

Application am 0mm 24.1906. Serial No. 340.321.

from underneath. tical sectional view taken on line 3 3 of Fig. 2through the support; and Fig. 4 is an enlarged vertical sectional viewthrough the support, taken on line 4 4 of Fig. 2.

In the drawings, (1 indicates a support; b,-a llexible cord in which arethe usual wires; 0, a weighted pulley, and d a common form of anincandescent electric lamp having the socket c, to, which the wires inthe cord 1) are attached in the. usual way.

The support (L is constructed, preferably, of porcelain and shaped tohave the Cll'CUliU base 5 secured to the ceiling by screws 6 .6

and merging into the raised central portion, which is the cord-duct 8,the \\'lI '()LlUCtS" leading to the usual elcctric'\vire con ,7, in 9 e,nections 1U 10, and the improximutely square oil-center opening 11,extending through the face to The back and having disposer wedge-shapedthe semicircular concave the end walls of the opening, as showniu Figs.3 and 4, a filling member 14, con

structed, preferably, of poreelainand shaped to have the base 15 withthe arms 16116 adapted to lit in the wedge-shapedrecesses 12 12, andhaving the semicircular concave ends 17 17, which coincide with thesini-i circular bottoms 1313 of the recesses 12 12,

This member 14 is locked inthe back of the opening 11' by the ceilingwhen the su port is secured to the ceiling, as shown in *ig. 1. A shaft18 extends across the openilu 11 and supported at each end in the circuar cavities formed .by. the semicircular bottoms 13 13 of the endrecesses 12 12 and the semicircular ends 17 17 oftlie arms on theiillingpiece 14, as shown in Figs. 3 and 1. grooved cam-pulley 19 isrotatably supported on the shaft 18 inthe opening 11. This campullcy isconstructed, preferably, material and shaped to have an annular centralgroove 2O ap )roximately' one-half the diameter of the pulley and thedouble semicircular cam-grooves 21 21 extending 911 Fig. 3 is anenlarged verthe oppositelyrecesses 12 12, with bottoms .13 13in I offibroid I each side from thebottom of the central I) is so in Fig. 2, orthe cord may be more firmly secured by knotting the cord at theintersection of the ducts. The lower end of the cord is now passed downunder the pulley c, (which is sufficiently heavy to overbalance theweight of the lamp in any position'of the lamp,) then up over thecam-pulley 19,- and then down to the lamp, as shown in Fig.

In the operation of my improvedincantlescent-eIectric-lamp support ashort downward pull on the lamp (L will release and bring the cord 7)into the central groove 20 of the cam-pulley 19, as shown in full linesin Fig. 3. The lamp may'now be adjusted vertically into the positionrequired, when a side and an upward movement of the lamp will bring thecord into one of the cam-grooves 21 21, which will force the cordsidewise out of the central groove 20 toward the circumference of thepulley, where, through the pull of the weighted pulley c, the cord iswedged between the bottom of the camgroove 21 and the side alls ol' theopening 1] or the inner face of the filling member 14, as shown inbroken lines in Fig. 3, and the lamp when released is held securely inthe ad- 1 l opposing walls formed by Sfild' opening being justedposition, as shown in Fig. 1.

It is evident that the construction of the support could be varied sothat a double cord could be used, if desired, without materiallyallecting the spirit of my invention.

Having thus described my invention, 1

claim new and desire to secure by Letters Patent 1. A lamp-supportembodying a base 'iorrned with an opening which extends I through thetop and bottom of said base, two

of the side Walls formed by said opening being formed with recesseswhich extend from the top ol said base downwardly to points at a slightdistance from the bottom of said base, said recesses terminating insemicircular bottoms, a pulley-carrymg shaft enweighted a in in' saidsemicircular bottoms and a 4 D O 7 filling member having a base ofapproximately ti 3 same width the distance be- 1 1 tween said recessesof the s de Walls and dc-- portion formed with a cordduet and withWire-ducts which lead into said cord-duct, wire'connections disposed atthe outer ends of said wire-ducts, said base being formed with anell-center opening, two of the Walls formed by said opening being.t'ormed with wedge-shaped recesses terminating in semi, circularbottoms, a filling member having a base closing the top of said openingand arms shaped to fit in said recesses and provided with semicircularconcave ends coinciding with said concave bottoms'of said recesses, ashat t extending across said opening and having its ends extending insaid semicircular portions of the recesses and said ends of said arms,and a pulley on said shaft.

3. A lamp-support embodying a base formed with an opening extendingthrough the top and bottom of said base, two of the formed with verticalrecesses terminating in shaft-seats which latter are disposedintermediate t he top and bottom of said base, a filling member having abase at the top of the opening and formed with depending'arms to slidein said recesses of the side Walls and have. their lower endsoverlie-the shaft-seats and engage the shaft.

In testimony WhereotI have signed my name to this specification in thepresence of two subscribing Witnesses.

JOHN SULLIVAN.

Witnesses: I ADA E. HAGER rY J. A. MILLER.

